Journal
PROSTAGLANDINS & OTHER LIPID MEDIATORS
Volume 136, Issue -, Pages 90-95Publisher
ELSEVIER SCIENCE INC
DOI: 10.1016/j.prostaglandins.2018.02.004
Keywords
Soluble epoxide hydrolase (sEH); Non-urea sEH inhibitors; Liver microsomal stability assay; Structure activity relationship (SAR) study; Isosteres
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Funding
- National Institute of Environmental Health Science (NIEHS) [R01 ES002710]
- NIEHS [P42 ES004699]
- NIGMS [T32GM099608]
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We have previously identified and reported several potent piperidine-derived amide inhibitors of the human soluble epoxide hydrolase (sEH) enzyme. The inhibition of this enzyme leads to elevated levels of epoxyeicosatrienoic acids (EETs), which are known to possess anti-inflammatory, vasodilatory, and anti-fibrotic effects. Herein, we report the synthesis of 9 analogs of the lead sEH inhibitor and the follow-up structure-activity relationship and liver microsome stability studies. Our findings show that isosteric modifications that lead to significant alterations in the steric and electronic properties at a specific position in the molecule can reduce the efficacy by up to 75-fold. On the other hand, substituting hydrogen with deuterium produces a notable increase (similar to 30%) in the molecules' half-lives in both rat and human microsomes, while maintaining sEH inhibition potency. These data highlight the utility of isosteric replacement for improving bioavailability, and the newly-synthesized inhibitor structures may thus, serve as a starting point for preclinical development. Our docking study reveals that in the catalytic pocket of sEH, these analogs are in proximity of the key amino acids involved in hydrolysis of EETs.
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